Arrangement of auxiliary devices for internal combustion engines



' May 943 A. FRIEDRICH EI'AL 1,319,314

ARRANGEMENT 0F AUXILIARY DEVICES FOR INTERNAL COMBUSTION ENGINES Filed April 10, 1941 BY a4 Q44? ATTORNEB" I Patented May 18, 1943 ARRANGEMENT OF. AUXILIARY DEVICES FOR INTERNAL COMBUSTION ENGINE Albert Friedrich and Otto Goppel, stuttg art Bad Canstatt, Germany; vested in the Allenlroperty' Custodian Application April 10, 1941, Serial No. 387,890.

In Germany Aprill'i, 194i) 6 Claims. (Cl.'1'23-59) The invention relates to an arrangement of auxiliary devices, especially of spark plugs, for internal combustion engines with several cylinders located next to each other. The object of the invention is above all such an arrangement of these auxiliary devices that they allow a most short construction length of the engine, even if the auxiliary devices are mounted as far as possible into the angles formed between the cylinders, as it may be for instance of advantage, when several spark plugs or several injecting nozzles are arranged at the same cylinder of an engine, which for instance may work with petrol-injection during the suction stroke. In such cases the best combustion will be reached for instance, if the spark plugs of each cylinder are arranged as far as possible from each other. It herewith the spark plug connections are all to be on the same engine side, and the sparking poles lying mostly in one plane, difficulties may arise, because a limit is set to the arrangement of the plugs in the largest possible distance from each other by the fact that the spark plugs of neighbouring cylinders should not touch each other, and besides require sufiicient space for screwing in and out.

An essential feature of the invention consists in the fact that the spark plugs or the corresponding auxiliary devices of two neighbouring cylinders are so arranged with respect to each other that they cross each other. By these means it is possible to arrange the spark plugs or auxiliary devices, at a certain distance between two cylinders, in a greater distance from each other than it was possible hitherto, or on the contrary, at the same distance of the plugs or auxiliary devices, to decrease the distance between the cylinders. Preferably the spark plugs crossing each other will be mounted in a common recess of the cylinder block.

In the accompanying drawing, Fig. 1 shows diagrammatically a known arrangement of the spark plugs, Fig. 2 is a view similar to Fig. 1 showing a new arrangement in accordance with the present invention, Fig. 3 is a partial side view of an engine showing the external portions of adjacent spark plugs of adjacent cylinders, whereas Fig. 4 shows a cross-sectional View through a cylinder block of an internal combustion engine near the spark plug holes, showing the arrangement of the plugs.

In the two Figs. 1 and 2 the cylinders are indicated with a respectively, and the left hand spark plugs of each cylinder with In, andthe right hand spark plugs with In. If for instance the spark plugs are located in the same plane perpendicular to the cylinder axis, as assumed in Fig. 1, the spark plugs in and In of each cylinder may be arranged in a greatest distance in from each other, or in an angle on to the central transverse plane y of the cylinder.

If however the arrangement is made according to Fig. 2, where the neighbouring spark,

plugs in and D2 of the two cylinders are arranged one above the other, and crossing each other, the distance between the spark plugs of the same cylinder may be increased to :r1=:c+e and the angle to the angle c1. The spark plugs move thereby nearer to the line of symmetry z-z of the row of cylinders, which causes a more uniform ignition of the mixture within the cylinder.

The Figs. 3 and 4 show more structural types of the invention in a view and a cross section through the cylinder. The engine casing has on one longitudinal side recesses 11, in which the spark plugs are arranged accessible from the outside. The spark plug in is arranged slantingly towards above and the spark plug in slantingly downward, in order to make it possible that in spite of the crossed arrangement of the spark plugs, their electrodes may be able to lie in the same plane, perpendicular to the cylinder axes.

The invention is specially advantageous for v-shaped engines with a very narrow V-angle, where at the inlet side there is no room for the arrangement of the spark plugs, and correspondingly it will not be possible to arrange the spark plugs in transverse direction, i. e. n a plane which is perpendicular to the plane of symmetry of the cylinders.

We claim:

1. An internal combustion engine having a pair of adjacent cylinders, and a pair of spark plugs, one for eachcylinder, positioned side by side intermediate said cylinders with their axes crossing, whereby said spark plugs occupy a minimum of space in the longitudinal direction of said engine, and said cylinders may be positioned closely to one another.

2. In an internal combustion engine with an engine casing with at least two cylinders next to each other, with at least two spark plugs each, for each of the cylinders, the spark plugs being arranged in a distance as great as possible from each other on the longitudinal side of the cylinder, the two neighbouring spark plugs of the two cylinders being arranged in such a way, that seen in the plan view of the cylinders, they lie above each other, within the angle formed between the cylinders, and their axes crossing each other.

3. In an internal combustion engine the combination according to claim 2, at least the axis of one of the two spark plugs as seen in plan view crossing each other, being arranged slantingly to a plane perpendicular to the cylinder axis, in such a manner that the spark plugs enter the cylinder substantially at the same height when seen in the axial direction of the cylinder.

4. The combination according to claim 1, in which said spark plugs lie one above the other, and the axis of at least one spark plug extends obliquely to a plane perpendicular to the cylinder axis in such a manner that both spark plugs enter their respective cylinders at substantially the same height, as measured in the axial directlon of the cylinders.

5. An internal combustion engine having a pair of adjacent cylinders, and a pair of auxiliary devices one extending into each cylinder and being accessible from the outside, said auxiliary devices being positioned side by side intermediate said cylinders with their axes crossing and lying one above the other, whereby said auxiliary devices occupy a minimum of space in the longitudinal direction of said engine, and said cylinders may be spaced closely to one another.

6. The combination according to claim 5, in which the axis of'one of said auxiliary devices extends obliquely to a plane perpendicular to the cylinder axis, in such a manner that both auxiliary devices extend into the respective cylinders at substantially the same height as seen in the axial direction of the cylinders.

ALBERT FRIEDRICH. OTTO GOPPEL. 

